Microwave ovens make use of x-ray deviation to feverishness food. The microwaves have been engrossed by a H2O molecules in a food, which is eliminated to alternative components of a food. As a H2O becomes hotter, so does a food.
Suppose which a x-ray deviation has a wavelength of 11.2 cm. How most photons have been compulsory to feverishness 275 mL of coffee from 25.0 C to 62.0 C? Assume which a coffee has a same density, 0.997 g/mL, as well as specific feverishness capacity, 4.184 J/(g* K), as H2O over this heat range.
(answer is in photons)
First find energy of a photon using eqn
E = [(planks constant)(speed of light) / (give wavelength)]
Then find the required to heat 275 mL of coffee from 25.0 C to 62.0 C, using density and specific heat capacity given to find mass.
Now you have the E required for the rxn so divide that by the E of a photon and you have your answer in number of photons required needed to complete the rxn.